Typewriting machine



Aug. 14, 1934. H. A. AVERY TYPEWRITING MACHINE Filed Jan. 15, 1952Ihwentor HENRY A. AVERY (Ittoniegs Patented Aug. 14, 1934 'TYPEWRITINGMACHINE Henry Allen Avery, Groton, N. Y.,. assignor to L. C Smith &Corona. Typewriters Inc.I New York, N. Y., a corporation of New YorkApplication January 15, 1932, Serial No. 586,725 4 Claims (01. 191-121)This invention relates to improvements in typewriting machines and moreparticularly to improvements in paper feeding and guiding means for saidmachines.

The invention provides a highly efficient paper feeding and guidingmeans the parts of which are of light weight, very compactly arrangedand ofexceptionally small number, thus affording a paper feeding andguiding means especially suit- 10 able for small portable typewritingmachines.

The invention also providesa paper feeding and guiding means wherein apaper guiding table and a plurality of feed rolls are yieldably urgedtoward the platen and are shifted. from the platen 15 to release thepaper by an'exoeedingly simple means correlated therewith to act thereonin a manner insuring highly efficient paper feeding and paper releasingactions.

Other objects and advantages of the invention will appear from thefollowing descriptionof the preferred embodiment of the inventionillustrated-in the accompanying drawing.

In the drawing, 7 Fig. 1 is a top plan view of the platen carriage z ofa typewriting machine provided with the improved paper feeding andguiding mechanism; Fig. 2 is a vertical sectional view on theline 2-2 ofFig. 1, showing thefeed rolls engaged with the platen; Fig. 3 is avertical sectional view on the line 33 showing the feed rolls and papertable re leased;

Fig. 4 is a fragmentary bottom plan view showing parts of the platencarriage and paper table; s and Fig. is a fragmentary perspective viewof the paper feeding and guiding means inverted to clearly show certainfeatures of construction thereof.

The parts of the improved paper feeding and guiding means are shownmounted on the platen carriage of a portable typewriting machine, theplaten roller 10 having its shaft 11 journalled in bearings 12 on theend plates 13 of the platen carriage, which end plates are connected bythe base plate 14 of the carriage. The platen roll is rotatable by theusual finger wheels 15 on the platen shaft, or by the usual line spacingmechanism which includes a ratchet wheel 16 held to one end of theplaten roll.

' A sheet metal paper supporting and guiding table 1'7 extends under theplaten roll between the carriage and plates and between the platen rolland the carriage base plate, said table being curved or bowedtransversely of the platen with its concave face uppermost or nearestthe platen. In the front-edge of table 17 there is a long; shallowrecess or notch 18, the ends of which are.

located equidistant. from the table ends, and

the rear longitudinal edgeof which is preferably. formed witha shortpendent lip or flange 19. A long front feed roller 20 fixed on a frontfeed roll shaft 21 is located in this recess 18, the ends I the ends ofshaft 21 and the ends of roller 20 bing equidistant from the respectiveends of the table, so that the front roll centered longitu dinally ofthe table which, in turn, is similarly 7 centered relatively to theplaten longitudinally of the platenas hereinafter described. The openthroats of the hook bearings 22 face toward the paper table.

A rear feed roll shaft 24, longer than shaft 21 extends longitudinallyof the table 17 at the convex or under face, of the table and has itsends journalled in the slightly'pendenthooklike ends 25 of two bearinglugs '26 formed on the table at the outerends of the forward edges oftwo relatively short longitudinal slots 2'1 in the table. The openthroats of hook bearings 25 face toward the convex face of the'table.Two short rear feed rollers 28 are fixed on shaft 24 and project throughthe short slots 27 be- 9 yond the opposite or concaveface of the table asubstantial distance to the rear of the. front feed.roller. Slots 27-androllers 28 are equal distances from the respective ends of the papertable,v shaft 24 and its bearings being centered longitudinally of thetable with the rollers 28. equidistant from thefshaft endsand eachcross-, ing the vertical fore and aft or transverse plane of a differentend of the longitudinally centered front feed roller 20. ment of three.feed rolls (a forward and two rear rolls) is effective to feed the papersmoothly and in a straight path. i i n The table is normally supportedor held up to yieldably hold the feed rollers against the platen roller,or against paper fed between the platen roller and said rollers, at onepoint only, as hereinafter described, the table supporting means looselyengaging or merely abutting the table at the convexface of the table.The table,

This staggeredv arrange m0 thus loosely supported at one point only, ismaintained in longitudinally centered relation with the platen roller,i. e. with its ends equidistant from the ends of the platen roller, by apair of positioning pins or studs 29 depending from the table and ofsufficient length and diameter to always extend loosely (with asmallradial' clearance) through a pair of holes 30in the base plateplatenroller at the rear of the carriage, paper table, and platenroller. Shaft 31 has a reduced inner end 34 journalled in a bracket 32held to the carriagebase plate to the left of the middle of thecarriage, andsaid shaft extends to the right hand end plate of thecarriage where its outer endis journalled on the inner end of a pivotscrew 33 tapped through said plate. A forwardly extending rock arm'35fixed on shaft 31 is located in the medial fore and aft vertical planeof the platen roller andpaper table and is bent to clear the table inall vertically shifted positions of the table except at its forward endor tip which is adapted to loosely abut or contact the under or convexface of the table at a point in said medial plane midway between thefront and rear feed rolls or equidistant from said shafts and the axesof the front and rear feed rollers.

'At its outer or right hand end, at the inner face of the .right handend plate of the carriage,-the rock shaft 31 has fixed thereon a rockarm 36 extending forwardly between the platen shaft 11 and base plate 14of the platen carriage and normally held yieldably drawn or rockedupward by a coil spring 37 to thereby hold arm 35 rocked upward in aposition in which it holds the table17 lifted a substantialdistance'from the base plate 14 to press the feed rolls against theplaten'roller', or against paper interposed between the platen roller onthe one hand and the feed rollers and paper table on the other hand,this position of the parts being shown in Figs. 1, 2 and 5. Spring 37 isconnected at its lower end to the forward end of rock arm 36 and'extendsupwardin 1mm of the platen shaft'to an anchor stud or pin 38 projectinginward from the right hand end plate of the carriage. v

It will be observed that the system of feed muers engages the platenroller equally at both sides ment at a single point located centrallyofthe feed roller system and midway the ends of the platen roller andpaper table, at the intersection of planes A-A and B-B, by the front endedgeof arm 35 which urges the feed rollers'equally to the platen rollerby pressure transmitted to the table at said point from the single'spring' '37.

This method of table and feed roller support together with the loose fitof the positioning pins 29 in holes 30 permits a limited universaltilting of the table to compensate for slight inequalities in the platenand feed rollers and the paper and insures straight feeding of the paperat an even rate.

The table and feed rollers may be lowered to the-paper-releasing orfeed-roll cast-ofl-position I shownin Fig. 3 by "rocking shaft aragainstthe pull of spring 37. For this purpose, and to lock the parts incast-off position, a hand-operated release lever 39 of bellcrank form ispivoted at the inner face of the right hand end plate 13 of the carriageon a pivot 40 mounted on said plate for fore and aft swinging of theupstanding handle arm of the release lever. The other arm of thebellcrank hand lever carries at its end a laterally projecting pin orstud 41 which works in a recess 42 in the'upper edge of rock arm 36, andnormally engages the rearwardly facing front end wall of said recess andis slightly out of contact with the-bott'om'or' upwardly facing wall ofsaid recess whenthe feed rolls contact the platen, as shown in Fig; 2.The recess is of such length and depth that when the handle arm of level39 is drawn forward to swingthe normally forwardly. extendingstud-carrying arm downward,tarm 36 is depressed 'tojdepress arm'35sufflciently toallow the table 1'7 to seat on the 'carriagebase plate14- (aii'ording maximum feedroll clearance from the platen in cast-offposition), and stud '41 engages the forwardly'facing rear end wallv ofthe recess 42 with the engaged lever and arm parts in dead. centerrelation to lock the parts in paper-releasing or feed-roll cast-oilposition, as shown in'Fig. 3.

A suitable letter space scale 43 isheld by screws 11 44 to pendent lugs45 atthefront edgeofpaper tablel'l. 3,

WhatI claim is: Y 3

1. Paper feeding means comprising a platen carriagehaving a baseplate-provided with apertures aligned longitudinally of the carriage, aroller platen 'journall'ed on the carriage. tozextend longitudinally ofthe carriage, a paper table interposed betweentheplaten and baseplateand shiftable facewise 'between'said platen and base no plate, pinsfixed at one end to 'said table; in alignment longitudinally of thetable and loosely fitting and telescoping in'the base plate aperturesduring facewise shifting of the paper-table, a system'of tandem feedrolls journalled' on the 1 5 paper table to shift as'a unit with thetable toward and from the platen, a single spring-urged device normallyyieldingly-supporting the table out of contact with'the base plate topress the system of feed rolls to the platen, said device beingengageable with the table solely at a point on the table locatedcentrally of the system of feed rolls, and manually shiftable means onthe carriage for actuating said spring-urged. means to lower the tableto the base plate ofv the 'car- 5 r1886. I

2. Paper feeding means comprising a platen carriage having a base plateprovided with aperv tures aligned longitudinally of the carriage, aroller platen iournalled on thecarriage to extend o longitudinally ofthe carriage, a paper table interposed between the platen and base plateand shiftable facewise-between said platen and; base plate, pins fixedat one end to said table in alignment longitudinally of the table andloosely fltting and telescoping in the base plate apertures duringfacewise shifting of the paper table, a-

system of tandem feed rolls Journalledon the paper table to. shift as aunit-with; the table toward and from the platen, a. single-,springl, 50

urged arm pivoted on the carriage to swing toward and from the platenand extending transversely of the platen under the table, said arm beingnormally loosely engaged under the paper table midway the ends of thetable to yieldingly hold the table spaced above the base plate and urgethe system of feed rolls to the platen and being the sole means forholding the table spaced above the base plate of the carriage, andmanually shiftable means on the carriage for swinging said arm downwardat will.

3. Paper feeding means comprising a roller platen, a platen support inwhich the platen is journalled having a base plate which extendslongitudinally of the platen below the platen and is provided withapertures aligned longitudinally of the platen, a paper table interposedbetween the platen and base plate, pins pendent from the table andhaving loose sliding fits in the base plate apertures for guiding thetable to shift facewise between the platen and base plate, a system oftandem feed rolls journalled on the table to shift as a unit with thetable, a rock shaft journalled on the support and extendinglongitudinally of the platen, a single table supporting rock armextending forward from said shaft under the table and engageable withthe table solely at a' point on the under face of the table locatedcentrally of the' system of ,feed rolls, a second rock arm extendingforward from said shaft adjacent one end of the support, a

spring connected to said second arm and normally urging the sameupwardly to cause the first arm to yieldingly hold the table out ofcontact with the base plate for pressing the feed rolls to the platen,and a manually shiftable cam device pivoted on the support and shiftableabout its pivot to depress and lock down the second arm.

4. Paper feeding means comprising a roller platen, a platen support inwhich the platen is journalled, said support having a base plate underthe platen provided with apertures aligned longitudinally of the platen,a paper table between the platen and base plate having pendent pinsslidably engaged in said apertures, a system of tandem feed rollsjournalled on the table and engageable with the platen, a rock shaftjournalled on the support and extending longitudinally of the platen andhaving a single table supporting arm, a spring normally rotativelyurging said rock shaft in a direction to cause said arm to hold thetable elevated above the base plate with the feed rolls pressed to theplaten, said arm engaging under the table at a point located centrallyof the system of feed rolls to hold the table elevated above the baseplate, and manually operable means adjacent one end of. the.

support for rocking said shaft in opposition to said spring to lower thetable for casting off the feed rolls from the platen.

HENRY A. AVERY.

